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With stock tire height (255/60/15 or 225/70/15) my L-82 4 speed (all stock) and 3.70 gears should turn exactly 2,860 RPM's at 60 mph which it does. At 70 MPH, my car is turning approximately 3,500 RPM. Now you know the reason so many 4 speed owners convert to 5 speeds with the overdrive. It is normal! One of these days I will do the conversion as well. Hope that helps!
My mechanic was wondering what kind of gears were in there? I thought it was normal. How ever I thought I would ask. Get some feed back with you that own and drive these cars.
I will look for the code. I have to replace a clip on one of the yokes.